I saw Sabine Hossenfelder's recent video on Cold Fusion aka LENR, and I wish I had a dollar for every time she says "there's just one problem." At least I can feel smug about a Facebook article on fusion in which the author didn't know the difference between nuclear reactions and chemical reactions. Several commenters corrected him.
I think she's running out of things to talk about. She has a bad habit of making videos that say basically very little or just express her opinion as fact...
Rollin', Rollin', Rollin',
Rollin', Rollin', Rollin',
Rollin', Rollin', Rollin',
Rollin', Rollin', Rollin',
Rawhide!
I presume you are referring to Doppler shift in which the wavelength of the emitted radiation depends on the motion of the object at the instant the photons are emitted. If the object is travelling away from us, the wavelength is shifted towards the red end of the spectrum and towards the blue end if the object is travelling towards us.
There is no "varying c" because photons always travel with speed c in a vacuum. The shift in wavelength is compensated for by a shift in frequency and so the velocity doesn't change.
This is illustrated by the wave equation: velocity = frequency x wavelength. If the wavelength is doubled, the frequency is halved and so the velocity remains the same.
Does that answer your question? I don't always get feedback when I make the effort!
I'm surprised by this question given the time you have spent on this thread.
The fact that the speed of a photon always measures the same regardless of the motion of its source is a fundamental tenet of special relativity.
It's not something I dwell on. At your age are you not reminded of something from time to time?
it just occurred to me..again. 😳
it just occurred to me..again. 😳
I remember that I asked if I had answered your first question.
My short term memory is still intact!
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